On this day in 2005, Discovery astronaut Stephen K. Robinson became the first person to do a spacewalk underneath a space shuttle orbiter.

During the Mercury, Gemini, and Apollo missions, one of NASA’s concerns was the safety of its crews, something it monitored rigorously through the use of biomedical instrumentation. As initial flight planning commenced in 1959, biomedical equipment capable of transmitting from space did not exist. NASA quickly brought together medical staff and hardware engineers to develop biomedical technology.

I recently shared that we uncovered handwritten notes and markings inside the Apollo 11 Command Module Columbia—the spacecraft that carried astronauts Armstrong, Collins, and Aldrin into lunar orbit and home on their historic voyage of July 1969. As part of our collaboration with the Smithsonian’s Digitization Program Office to create a detailed 3D model of the spacecraft, we had access to previously inaccessible areas for the first time in many years. We found notes written on a number of locker doors and even a small calendar used to check off days of the mission. We did our best to imagine the circumstances surrounding the creation of these markings. In the weeks that have passed, I have been working with an extraordinary team of experts to see what we can learn about each of the markings we documented, especially the more technical numerical entries. Today, we are posting the Apollo Flight Journal (AFJ) website, a detailed account of all the information we’ve gathered so far.

Scientific images can rival those of the most talented artists, a fact that is now on display in A New Moon Rises at our Museum in Washington, DC. Take, for example, an image of Reiner Gamma, a beautiful and strange feature on the Moon that looks as though a tadpole has been painted across the flat surface of Oceanus Procellarum. The image demonstrates the phenomenon of lunar swirls – bright patterns that some scientists believe may result from the solar wind striking the lunar soil. A localized magnetic field anomaly may have given this swirl its peculiar shape. The photo is densely packed with scientific information.

Training underwater for extravehicular activity (EVA)—popularly known as spacewalking—is now critical for preparing astronauts to work in weightlessness. But when cosmonauts and astronauts first ventured outside their spacecraft 50 years ago, in 1965 and 1966, they had no such training. Spacewalking did not appear difficult, nor did space program officials think that underwater work was needed. In the United States, it took Eugene Cernan’s June 1966 Gemini IX EVA to change attitudes. Fighting against his pressurized suit, while trying to do work without adequate handholds and footholds, Cernan quickly became exhausted and overheated. Only afterward did NASA Manned Spacecraft Center in Houston reach out to a tiny company outside Baltimore: Environmental Research Associates, Inc. (ERA). Funded by another agency center, it had been experimenting with EVA simulation in a rented school pool on nights, holidays, and weekends. That project became the foundation for Houston’s first underwater training facility.